Explanation:Flower:The Flower is the reproductive part of the plant.Flowers are of two types - unisexual flowers and bisexual flowers.The flower is the only part which takes part in the process of reproduction.Unisexual Flower:The flower has only one reproductive system.They can have a male reproductive system or a female reproductive system.Pollination is always cross.Examples: Papaya, watermelon, corn.Bisexual Flower:Bisexual flowers have both sets of the reproductive system in them.Both male and female reproductive parts are present in this kind of flower.Pollination can be the self type or cross-type.Examples: Hibiscus, rose, sweet pea, Mustard, Sunflower.